Locomotive diesel engine turbocharger and turbine stage...

Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system – Mechanical

Reexamination Certificate

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Details

C703S006000, C415S160000, C415S048000, C415S090000, C415S164000, C060S223000, C060S602000, C060S605200

Reexamination Certificate

active

10762396

ABSTRACT:
A method for fabrication of a locomotive diesel engine turbocharger turbine stage so as to avoid harmonic vibration in the turbine blades when the engine is operated at pre-selected throttle settings. Upon determining throttle settings for the engine and modeling of the turbocharger therefor, at least one natural vibration frequency of the turbine blades and a turbine nozzle vane excitation frequency as a function of turbocharger rotation speed are determined. Then the data obtained is analyzed to ascertain whether at least one data coincidence, that is whether a rotation speed correlative of a throttle setting has a coincidence over a predetermined range of both a natural frequency and said turbine vane nozzle excitation. If not, the model is suitable for fabrication of the turbocharger; if so, the model is modified by changing blade stiffness and/or vane numbering until no data coincidences are present.

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